Effects of recycling agents on aged asphalt binders and reclaimed asphalt concrete |
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Authors: | Ping-Sien Lin Tung-Lin Wu Chi-Wen Chang Bang-Yan Chou |
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Affiliation: | (1) Department of Civil Engineering, National Chung Hsing University, Taichung, Taiwan, ROC; |
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Abstract: | This paper aims to study the effect of adding different ratios (from 10 to 40%) of three recycling agents (RAs), including
RA-25, RA-75 and RA-250, to the reclaimed asphalt binder (RAB) with a viscosity of 42800 poises and also to the reclaimed
asphalt concrete (RAC) according to the Marshall mix design method. The study includes a variety of tests designed to determine
the difference between the three RAs in terms of penetration, viscosity, softening point, ductility, toughness of the asphalt
binder, as well as indirect tensile strength, and stability value of Marshall specimens. The results show that adding the
RA increased the cohesiveness of RAB and thus improved the applicability of RAB. Of the three RAs in this study, RA-25 offered
the best performance when added to asphalt binder. This study proposes a recycling model to predict the changes in RAB viscosity
when adding RAs. The results of this model show a close fit with experimental data from laboratory tests. This model allows
highway engineers to estimate the amount of RA added to aged binder. Marshall tests show that the RA-75 specimen had higher
indirect tensile strength and stability value than the RA-25 and RA-250 specimens. Based on overall performance and cost comparisons
among the three RAs, this study regards RA-75 as the RA of choice. |
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